removed image with 404 (#26376)
Update README.md to remove 404 link on Posse image
diff --git a/README.md b/README.md
index 030e056..6b42b7b 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@
smooth natural scrolling, and platform awareness.
[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-1.png" width="270" height="480" alt="Brand-first shopping design" align="left">](https://github.com/flutter/flutter/tree/master/examples/flutter_gallery/lib/demo/animation)
-[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-2.png" width="270" height="480" alt="Fitness app design">](https://github.com/flutter/posse_gallery)
+<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-2.png" width="270" height="480" alt="Fitness app design">
[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-3.png" width="270" height="480" alt="Contact app design" align="left">](https://github.com/flutter/flutter/blob/master/examples/flutter_gallery/lib/demo/contacts_demo.dart)
[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/ios-friendlychat.png" width="270" height="480" alt="iOS chat app design">](https://codelabs.developers.google.com/codelabs/flutter/)
